{"id":70609,"date":"2026-02-02T05:05:50","date_gmt":"2026-02-01T21:05:50","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/70609.html"},"modified":"2026-02-02T05:05:50","modified_gmt":"2026-02-01T21:05:50","slug":"%e5%88%86%e6%9e%90%e4%b8%80%e6%ae%b5ds18b20%e6%b8%a9%e5%ba%a6%e6%98%be%e7%a4%ba%e4%bb%a3%e7%a0%81","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/70609.html","title":{"rendered":"\u5206\u6790\u4e00\u6bb5DS18B20\u6e29\u5ea6\u663e\u793a\u4ee3\u7801"},"content":{"rendered":"

\u4e3b\u51fd\u6570<\/p>\n

#include "public.h"<\/p>\n

void main()
\n{
\nu8 i=0;
\n int temp_value;
\nu8 temp_buf[5];<\/p>\n

ds18b20_init();\/\/\u521d\u59cb\u5316DS18B20<\/p>\n

while(1)
\n{
\ni++;
\nif(i%50==0)\/\/\u95f4\u9694\u4e00\u6bb5\u65f6\u95f4\u8bfb\u53d6\u6e29\u5ea6\u503c，\u95f4\u9694\u65f6\u95f4\u8981\u5927\u4e8e\u6e29\u5ea6\u4f20\u611f\u5668\u8f6c\u6362\u6e29\u5ea6\u65f6\u95f4
\ntemp_value=ds18b20_read_temperture()*10;\/\/\u4fdd\u7559\u6e29\u5ea6\u503c\u5c0f\u6570\u540e\u4e00\u4f4d
\nif(temp_value<0)\/\/\u8d1f\u6e29\u5ea6
\n{
\ntemp_value=-temp_value;
\ntemp_buf[0]=0x40;\/\/\u663e\u793a\u8d1f\u53f7
\n}
\nelse
\ntemp_buf[0]=0x00;\/\/\u4e0d\u663e\u793a
\ntemp_buf[1]=gsmg_code[temp_value\/1000];\/\/\u767e\u4f4d
\ntemp_buf[2]=gsmg_code[temp_value%1000\/100];\/\/\u5341\u4f4d
\ntemp_buf[3]=gsmg_code[temp_value%1000%100\/10]|0x80;\/\/\u4e2a\u4f4d+\u5c0f\u6570\u70b9
\ntemp_buf[4]=gsmg_code[temp_value%1000%100%10];\/\/\u5c0f\u6570\u70b9\u540e\u4e00\u4f4d
\nsmg_display(temp_buf,4);
\n}
\n}<\/p>\n

\u6570\u7801\u7ba1\u51fd\u6570<\/p>\n

#define SMG_A_DP_PORTP0\/\/\u4f7f\u7528\u5b8f\u5b9a\u4e49\u6570\u7801\u7ba1\u6bb5\u7801\u53e3<\/p>\n

\/\/\u5b9a\u4e49\u6570\u7801\u7ba1\u4f4d\u9009\u4fe1\u53f7\u63a7\u5236\u811a
\nsbit LSA=P2^2;
\nsbit LSB=P2^3;
\nsbit LSC=P2^4;
\n\/\/\u5171\u9634\u6781\u6570\u7801\u7ba1\u663e\u793a0~F\u7684\u6bb5\u7801\u6570\u636e
\nu8 gsmg_code[17]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
\n0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};<\/p>\n

void smg_display(u8 dat[],u8 pos)
\n{
\nu8 i=0;
\nu8 pos_temp=pos-1;<\/p>\n

for(i=pos_temp;i<8;i++)
\n{
\n switch(i)\/\/\u4f4d\u9009
\n{
\ncase 0: LSC=1;LSB=1;LSA=1;break;
\ncase 1: LSC=1;LSB=1;LSA=0;break;
\ncase 2: LSC=1;LSB=0;LSA=1;break;
\ncase 3: LSC=1;LSB=0;LSA=0;break;
\ncase 4: LSC=0;LSB=1;LSA=1;break;
\ncase 5: LSC=0;LSB=1;LSA=0;break;
\ncase 6: LSC=0;LSB=0;LSA=1;break;
\ncase 7: LSC=0;LSB=0;LSA=0;break;
\n}
\nSMG_A_DP_PORT=dat[i-pos_temp];\/\/\u4f20\u9001\u6bb5\u9009\u6570\u636e
\ndelay_10us(100);\/\/\u5ef6\u65f6\u4e00\u6bb5\u65f6\u95f4，\u7b49\u5f85\u663e\u793a\u7a33\u5b9a
\nSMG_A_DP_PORT=0x00;\/\/\u6d88\u97f3
\n}
\n}<\/p>\n

DS18B20\u51fd\u6570<\/p>\n

sbit DS18B20_PORT=P3^7;\/\/DS18B20\u6570\u636e\u53e3\u5b9a\u4e49<\/p>\n

void ds18b20_reset(void)
\n{
\nDS18B20_PORT=0;\/\/\u62c9\u4f4eDQ
\ndelay_10us(75);\/\/\u62c9\u4f4e750us,
\nDS18B20_PORT=1;\/\/DQ=1
\ndelay_10us(2);\/\/20US
\n}<\/p>\n

u8 ds18b20_check(void)
\n{
\nu8 time_temp=0;<\/p>\n

while(DS18B20_PORT&&time_temp<10)
\n{
\ntime_temp++;
\ndelay_10us(1);
\n}
\nif(time_temp>=10)return 1;
\nelse time_temp=0;
\nwhile((!DS18B20_PORT)&&time_temp<20)
\n{
\ntime_temp++;
\ndelay_10us(1);
\n}
\nif(time_temp>=20)return 1;
\nreturn 0;
\n}<\/p>\n

u8 ds18b20_read_bit(void)
\n{
\nu8 dat=0;<\/p>\n

DS18B20_PORT=0;
\n_nop_();_nop_();
\nDS18B20_PORT=1;
\n_nop_();_nop_();
\nif(DS18B20_PORT)dat=1;
\nelse dat=0;
\ndelay_10us(5);
\nreturn dat;
\n} <\/p>\n

u8 ds18b20_read_byte(void)
\n{
\nu8 i=0;
\nu8 dat=0;
\nu8 temp=0;<\/p>\n

for(i=0;i<8;i++)
\n{
\ntemp=ds18b20_read_bit();
\ndat=(temp<<7)|(dat>>1);
\n}
\nreturn dat;
\n}<\/p>\n

void ds18b20_write_byte(u8 dat)
\n{
\nu8 i=0;
\nu8 temp=0;<\/p>\n

for(i=0;i<8;i++)
\n{
\ntemp=dat&0x01;
\ndat>>=1;
\nif(temp)
\n{
\nDS18B20_PORT=0;
\n_nop_();_nop_();
\nDS18B20_PORT=1;
\ndelay_10us(6);
\n}
\nelse
\n{
\nDS18B20_PORT=0;
\ndelay_10us(6);
\nDS18B20_PORT=1;
\n_nop_();_nop_();
\n}
\n}
\n}<\/p>\n

void ds18b20_start(void)
\n{
\nds18b20_reset();
\nds18b20_check();
\nds18b20_write_byte(0xcc);
\n ds18b20_write_byte(0x44);
\n}<\/p>\n

u8 ds18b20_init(void)
\n{
\nds18b20_reset();
\nreturn ds18b20_check();
\n}<\/p>\n

float ds18b20_read_temperture(void)
\n{
\nfloat temp;
\nu8 dath=0;
\nu8 datl=0;
\nu16 value=0;<\/p>\n

ds18b20_start();
\nds18b20_reset();
\nds18b20_check();
\nds18b20_write_byte(0xcc);
\n ds18b20_write_byte(0xbe);<\/p>\n

datl=ds18b20_read_byte();
\ndath=ds18b20_read_byte();
\nvalue=(dath<<8)+datl;<\/p>\n

if((value&0xf800)==0xf800)
\n{
\nvalue=(~value)+1;
\ntemp=value*(-0.0625);
\n}
\nelse
\n{
\ntemp=value*0.0625;
\n}
\nreturn temp;
\n}<\/p>\n

\u4ee5\u4e0a\u4ee3\u7801\u5b9e\u73b0\u7684\u529f\u80fd\u662f，\u5728\u52a8\u6001\u6570\u7801\u7ba1\u4e0a\u663e\u793a4\u4f4d\u6e29\u5ea6\u503c，\u5305\u62ec3\u4f4d\u6574\u6570\u548c1\u4f4d\u5c0f\u6570\u3002<\/p>\n

\u76f4\u63a5\u770b\u4ee3\u7801\u53ef\u80fd\u6709\u4e9b\u7e41\u6742，\u5982\u679c\u6211\u4eec\u628a\u5b83\u4eec\u6309\u529f\u80fd\u6a21\u5757\u5212\u5206，\u5c31\u50cf\u6469\u6258\u8f66\u5305\u62ec\u6838\u5fc3\u90e8\u5206\u2014\u2014\u53d1\u52a8\u673a\u3001\u63a7\u5236\u90e8\u5206\u2014\u2014\u9f99\u5934\u3001\u9a71\u52a8\u90e8\u5206\u2014\u2014\u8f6e\u80ce，\u8fd9\u6837\u6211\u4eec\u5c31\u53ef\u4ee5\u96c6\u4e2d\u4e00\u70b9\u3002<\/p>\n

\u7531\u4e8eDS18B20\u5728\u6e29\u5ea6\u68c0\u6d4b\u8d77\u5230\u5341\u5206\u91cd\u8981\u7684\u4f5c\u7528，\u672c\u6587\u51e0\u4e4e80%\u7684\u5185\u5bb9\u90fd\u662f\u4ecb\u7ecd\u5b83，\u7136\u540e\u82b1\u8d39\u8f83\u5c11\u7684\u7b14\u58a8\u4ecb\u7ecd\u6570\u7801\u7ba1\u6309\u663e\u793a\u4e2a\u5341\u767e\u4ee5\u53ca\u5c0f\u6570\u70b9\u4f4d\u7684\u539f\u7406，\u6700\u540e\u4f1a\u6574\u5408\u524d\u9762\u4e24\u8005，\u518d\u5206\u6790\u4e00\u4e0b\u4e3b\u51fd\u6570\u7684\u542b\u4e49\u3002\u524d\u8a00\u5c31\u8bb2\u8fd9\u4e48\u591a，\u63a5\u4e0b\u6765\u6211\u4eec\u6765\u770b\u770b\u8fd9\u7bc7\u6587\u7ae0\u7684\u4e3b\u89d2\u2014\u2014DS18B20<\/p>\n

\u4e00\u3001DS18B20\u90e8\u5206<\/h2>\n

\u4ec0\u4e48\u662fDS18B20？\u4f60\u7684\u76f4\u89c9\u4e00\u5b9a\u662f\u201c\u6e29\u5ea6\u4f20\u611f\u5668\u201d，\u5b9e\u9645\u4e0a\u5b83\u8fd8\u6709\u5f88\u591a\u4f60\u4e0d\u77e5\u9053\u7684\u672c\u4e8b\u3002<\/p>\n

\u9996\u5148，DS18B20\u5e76\u4e0d\u5168\u662f\u6211\u4eec\u719f\u77e5\u7684\u4e09\u5f15\u811a，\u5b83\u8fd8\u6709\u5176\u4ed6\u4e24\u79cd\u5f62\u6001<\/p>\n

\"\"<\/p>\n

\u6211\u4eec\u4f7f\u7528\u7684DS18B20\u91c7\u7528\u7684TO-92\u5c01\u88c5，\u53ea\u6709\u4e09\u4e2a\u5f15\u811a\u3002<\/p>\n

\u5176\u6b21，\u8fd9\u5757\u5c0f\u5c0f\u7684\u6e29\u5ea6\u4f20\u611f\u5668\u5e76\u4e0d\u53ea\u8d1f\u8d23\u6d4b\u6e29，\u5176\u5185\u90e8\u8fd8\u5d4c\u5165\u4e86\u4e00\u4e2aAD\u8f6c\u6362\u5668，\u4e5f\u5c31\u662f\u8bf4，DS18B20\u5728\u81ea\u5df1\u6d4b\u5f97\u6e29\u5ea6\u6a21\u62df\u91cf\u540e，\u53c8\u81ea\u5df1\u5c06\u5176\u8f6c\u6362\u6210\u6570\u5b57\u91cf\u8f93\u51fa，\u4e00\u6c14\u5475\u6210\u3002<\/p>\n

\u6700\u540e，\u522b\u770bDS18B20\u5f15\u811a\u5f88\u5c11，\u5b9e\u9645\u4e0a，\u53ef\u4ee5\u66f4\u5c11\u3002\u5728\u5bc4\u751f\u7535\u6e90\u6a21\u5f0f\u4e0b，VDD\u5f15\u811a\u90fd\u53ef\u4ee5\u4e0d\u9700\u8981，\u53ea\u9760DQ\u5f15\u811a\u5728\u63a5\u6536\u6570\u636e\u7684\u540c\u65f6，\u987a\u4fbf\u7ed9DS18B20\u4f9b\u7535\u3002<\/p>\n

\n

1.\u6982\u8ff0<\/h3>\n

DS18B20\u6570\u5b57\u6e29\u5ea6\u8ba1，\u53ef\u63d0\u4f9b9~12\u4f4d\u5206\u8fa8\u7387\u7684\u6444\u6c0f\u6e29\u5ea6\u6d4b\u91cf，\u53ef\u914d\u7f6e\u4e0a\u4e0b\u9650\u62a5\u8b66\u529f\u80fd（\u65ad\u7535\u540e\u4e0d\u64e6\u9664），\u53ef\u901a\u8fc7DQ\u5f15\u811a\u4e0e\u4e2d\u592eMCU\u8fde\u63a5\u3002\u6b64\u5916，\u6bcf\u4e00\u5757DS18B20\u90fd\u6709\u4e00\u4e2a\u72ec\u4e00\u65e0\u4e8c\u7684\u201c\u8eab\u4efd\u8bc1\u201d\u2014\u2014\u5b58\u50a8\u4e8eROM\u76848\u4f4d\u5bb6\u65cf\u7801，\u7406\u8bba\u4e0a\u5355\u7247\u673a\u53ef\u4ee5\u540c\u65f6\u63a7\u52362\u76848\u6b21\u65b9\u4e2aDS18B20\u3002<\/p>\n

\u63a5\u4e0b\u6765\u6211\u4eec\u628a\u76ee\u5149\u8f6c\u5411\u90a3\u4e2a\u4f20\u5947\u5f15\u811a\u2014\u2014DQ，\u5b83\u90fd\u80fd\u4f20\u8f93\u54ea\u4e9b\u6570\u636e？\u8fd9\u53d6\u51b3\u4e8eDS18B20\u91cc\u9762\u653e\u4e86\u4ec0\u4e48\u6570\u636e<\/p>\n

\"\"<\/p>\n

\u5ffd\u7565\u5de6\u8fb9\u7684\u7535\u8def，\u53f3\u8fb9\u5c31\u662fDS18B20\u7684\u4e09\u4e2a\u5b58\u50a8\u5668\u2014\u201464\u4f4d\u7684ROM\u3001Scratchpad（\u6682\u5b58\u5668）\u3001EEPROM（\u975e\u6613\u5931\u6027\u5b58\u50a8\u5668），\u6211\u4eec\u770b\u770b\u90fd\u653e\u4e86\u4e9b\u4ec0\u4e48\u5728\u91cc\u9762<\/p>\n

64\u4f4d\u5149\u523bROM<\/h4>\n

ROM\u53ea\u53ef\u8bfb，\u4e0d\u53ef\u5199\u5165\u300264\u4f4dROM\u5206\u6210\u4e09\u90e8\u5206，\u5206\u522b\u662f<\/p>\n\n\u5b57\u8282\u5185\u5bb9\u8bf4\u660e<\/tr>\n\n\n\n\n
Byte 0<\/td>\n8\u4f4d\u5bb6\u65cf\u7801（family code）<\/td>\n\u56fa\u5b9a\u4e3a0x28(DS18B20\u7684\u6807\u8bc6)<\/td>\n<\/tr>\n
Byte 1~6<\/td>\n48\u4f4d\u552f\u4e00\u5e8f\u5217\u53f7<\/td>\n\u5168\u7403\u552f\u4e00\u7684\u8bbe\u5907ID，\u7531\u5382\u5bb6\u5149\u523b\u5199\u5165<\/td>\n<\/tr>\n
Byte 7<\/td>\n8\u4f4dCRC\u6821\u9a8c\u7801<\/td>\n\u5faa\u73af\u5197\u4f59\u6821\u9a8c\u5197\u4f59<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5355\u7247\u673a\u901a\u8fc7Read Rom[0x33]\u6216Search Rom[0xf0]\u547d\u4ee4\u8bfb\u53d6ROM\u4e2d\u768464\u4f4d\u6570\u636e<\/p>\n

\u6682\u5b58\u5668（Scatchpad）<\/h4>\n

\u8fd9\u91cc\u662f\u6e29\u5ea6\u6d4b\u91cf\u548c\u901a\u4fe1\u7684\u6838\u5fc3\u7f13\u51b2\u533a，\u65ad\u7535\u540e\u6570\u636e\u4e22\u5931，\u6240\u6709\u6e29\u5ea6\u8f6c\u6362\u7ed3\u679c\u548c\u914d\u7f6e\u6570\u636e\u9996\u5148\u5199\u5165\u6b64\u5904（\u6ce8\u610f\u8fd9\u4e2a\u201c\u9996\u5148\u201d）\u3002\u6682\u5b58\u5668\u51719\u4e2a\u5b57\u8282，72\u4f4d，\u53ef\u5206\u6210\u4e94\u90e8\u5206<\/p>\n\n\u5b57\u8282\u5730\u5740\u540d\u79f0\u529f\u80fd\u662f\u5426\u53ef\u6620\u5c04\u5230EEPROM<\/tr>\n\n\n\n\n\n\n\n\n\n\n
Byte 0<\/td>\n\u6e29\u5ea6LSB<\/td>\n\u6e29\u5ea6\u503c\u4f4e\u56db\u4f4d(\u5305\u542b\u5c0f\u6570\u90e8\u5206)<\/td>\n\u5426（\u8fd0\u884c\u65f6\u6570\u636e）<\/td>\n<\/tr>\n
Byte 1<\/td>\n\u6e29\u5ea6MSB<\/td>\n\u6e29\u5ea6\u503c\u9ad8 8 \u4f4d（\u5305\u542b\u7b26\u53f7\u4f4d）<\/td>\n\u5426（\u8fd0\u884c\u65f6\u6570\u636e）<\/td>\n<\/tr>\n
Byte 2<\/td>\nTH\u5bc4\u5b58\u5668<\/td>\n\u9ad8\u6e29\u62a5\u8b66\u9608\u503c<\/td>\n\u662f（\u5b57\u8282 2 \u7684 EEPROM \u5907\u4efd）<\/td>\n<\/tr>\n
Byte 3<\/td>\nTL\u5bc4\u5b58\u5668<\/td>\n\u4f4e\u6e29\u62a5\u8b66\u9608\u503c<\/td>\n\u662f（\u5b57\u8282 3 \u7684 EEPROM \u5907\u4efd）<\/td>\n<\/tr>\n
Byte 4<\/td>\n\u914d\u7f6e\u5bc4\u5b58\u5668<\/td>\n\u5206\u8fa8\u7387\u8bbe\u7f6e<\/td>\n\u662f（\u5b57\u8282 4 \u7684 EEPROM \u5907\u4efd）<\/td>\n<\/tr>\n
Byte 5<\/td>\n\u4fdd\u7559<\/td>\n<\/td>\n\u5426<\/td>\n<\/tr>\n
Byte 6<\/td>\n\u4fdd\u7559<\/td>\n<\/td>\n\u5426<\/td>\n<\/tr>\n
Byte 7<\/td>\n\u4fdd\u7559<\/td>\n<\/td>\n\u5426<\/td>\n<\/tr>\n
Byte 8<\/td>\nCRC\u5b57\u8282<\/td>\n\u5bf9Byte0~7\u7684\u5faa\u73af\u5197\u4f59\u6821\u9a8c\u7801<\/td>\n\u5426<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u6ce8\u610f\u5230，\u4e0a\u8868\u4e2d\u589e\u52a0\u4e86\u4e00\u5217\u201c\u662f\u5426\u53ef\u6620\u5c04\u5230EEPROM\u201d，\u53ef\u4ee5\u628a\u8fd9\u4e2aEEPROM\u7406\u89e3\u6210\u4fdd\u9669\u7bb1，\u6211\u4eec\u628a\u6bd4\u8f83\u91cd\u8981\u7684\u6570\u636e\u5b58\u8fdb\u53bb，\u65ad\u7535\u540e\u5176\u4ed6\u6570\u636e\u88ab\u6e05\u9664，\u4fdd\u9669\u7bb1\u7684\u6570\u636e\u4f9d\u7136\u4fdd\u7559，\u8fd9\u6837\u4e0b\u6b21\u4e0a\u7535\u65f6\u8fd9\u4e9b\u6570\u636e\u5c31\u53ef\u4ee5\u76f4\u63a5\u53d6\u51fa\u6765\u7528\u4e86\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u7528DS\u81ea\u5df1\u7684\u8bed\u8a00\u8868\u8ff0\u5982\u4e0b：<\/p>\n

Write Scratchpad[0x4e]：\u5355\u7247\u673a\u901a\u8fc7 \u5411\u6682\u5b58\u5668\u4e2d\u5199\u5165TH\u3001TL\u548c\u914d\u7f6e\u6570\u636e；（\u52aa\u529b\u6323\u94b1）<\/span><\/p>\n

Read\u00a0Scratchpad[0xbe]：\u5355\u7247\u673a\u901a\u8fc7 \u5411\u6682\u5b58\u5668\u4e2d\u8bfb\u53d6TH\u3001TL\u548c\u914d\u7f6e\u6570\u636e，\u4f46\u53ef\u4ee5\u968f\u65f6\u901a\u8fc7\u590d\u4f4d\u4fe1\u53f7\u7ec8\u6b62\u8bfb\u53d6；（\u5408\u7406\u82b1\u94b1）<\/span><\/p>\n

Copy\u00a0Scratchpad[0x48] ：\u628a\u6682\u5b58\u5668\u4e2d\u7684TH\u3001TL\u548c\u914d\u7f6e\u6570\u636e\u590d\u5236\u5230EEPROM；（\u5f80\u4fdd\u9669\u7bb1\u5b58\u94b1）<\/span><\/p>\n

Recall EE[0xb8] ：（\u518d\u6b21\u4e0a\u7535\u540e）\u628aEEPROM\u4e2d\u7684TH\u3001TL\u548c\u914d\u7f6e\u6570\u636e\u590d\u5236\u5230\u6682\u5b58\u5668（\u4ece\u4fdd\u9669\u7bb1\u53d6\u94b1）<\/span><\/p>\n

EEPROM（\u975e\u6613\u5931\u6027\u5b58\u50a8\u5668）<\/h4>\n

\u8fd9\u4e2a\u5b58\u50a8\u5668\u76f8\u5f53\u4e8e\u4fdd\u9669\u7bb1，\u7528\u4e8e\u4fdd\u62a4\u62a5\u8b66\u9608\u503c\u548c\u5206\u8fa8\u7387\u914d\u7f6e，\u6389\u7535\u4e5f\u4e0d\u4e22\u5931\u3002\u8fd9\u4e2a\u4fdd\u9669\u7bb1\u5f88\u5c0f，\u53ea\u5b58\u4e86\u4e09\u6837\u4e1c\u897f<\/p>\n\nEEPROM\u5730\u5740\u6620\u5c04\u7684\u6682\u5b58\u5668\u5b57\u8282\u5b58\u50a8\u5185\u5bb9<\/tr>\n\n\n\n\n
Address 0<\/td>\nByte2 (TH)<\/td>\n\u9ad8\u6e29\u62a5\u8b66\u5668<\/td>\n<\/tr>\n
Address 1<\/td>\nByte 3(TL)<\/td>\n\u4f4e\u6e29\u62a5\u8b66\u5668<\/td>\n<\/tr>\n
Address 2<\/td>\nByte 4(Configuration)<\/td>\n\u5206\u8fa8\u7387\u914d\u7f6e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

EEPROM\u7684\u4e3b\u8981\u529f\u80fd\u5728\u4ecb\u7ecd\u6682\u5b58\u5668\u4e2d\u5c31\u63d0\u8fc7\u4e86，\u5206\u522b\u662f\u5b58\u94b1\u548c\u53d6\u94b1<\/p>\n

Copy\u00a0Scratchpad[0x48] ：\u628a\u6682\u5b58\u5668\u4e2d\u7684TH\u3001TL\u548c\u914d\u7f6e\u6570\u636e\u590d\u5236\u5230EEPROM；（\u5b58\u94b1）<\/span><\/p>\n

Recall EE[0xb8] ：（\u518d\u6b21\u4e0a\u7535\u540e）\u628aEEPROM\u4e2d\u7684TH\u3001TL\u548c\u914d\u7f6e\u6570\u636e\u590d\u5236\u5230\u6682\u5b58\u5668（\u53d6\u94b1）<\/span><\/p>\n

\n

\u73b0\u5728，\u6211\u4eec\u6e05\u695a\u4e86DS18B20\u4e09\u4e2a\u5b58\u50a8\u5668\u4e2d，ROM\u5b58\u653e\u201c\u8eab\u4efd\u8bc1\u53f7\u201d，\u6682\u5b58\u5668\u5b58\u653e\u6e29\u5ea6\u6570\u636e\u3001\u62a5\u8b66\u9608\u503c\u548c\u914d\u7f6e\u6570\u636e，EEPROM\u201c\u5b58\u94b1\u201d，\u5982\u6b64\u591a\u529f\u80fd，\u5982\u6b64\u591a\u6570\u636e，\u6211\u4eec\u6765\u770b\u770b\u52bf\u5355\u529b\u8584\u7684DQ\u5f15\u811a\u662f\u5982\u4f55\u8fde\u63a5\u4e24\u8005\u7684\u3002<\/p>\n

\"\"<\/p>\n

2.\u4ee3\u7801\u5206\u6790<\/h3>\n

\u590d\u4f4d\u51fd\u6570<\/h4>\n

void ds18b20_reset(void)
\n{
\nDS18B20_PORT=0;\/\/\u62c9\u4f4eDQ
\ndelay_10us(75);\/\/\u62c9\u4f4e750us,
\nDS18B20_PORT=1;\/\/DQ=1
\ndelay_10us(2);\/\/20US
\n}<\/p>\n

DS18B20\u7684\u901a\u4fe1\u6d41\u7a0b\u59cb\u4e8e\u521d\u59cb\u5316\u5e8f\u5217，\u8be5\u5e8f\u5217\u7531\u4e3b\u8bbe\u5907\u53d1\u9001\u7684\u590d\u4f4d\u8109\u51b2\u548cDS18B20\u53d1\u51fa\u7684\u5e94\u7b54\u8109\u51b2\u7ec4\u6210，\u4e0a\u9762\u4ee3\u7801\u4f53\u73b0\u7684\u662f\u590d\u4f4d\u8109\u51b2\u90e8\u5206\u3002\u4e3a\u4ec0\u4e48\u8981\u5148\u62c9\u4f4eDQ\u4e00\u6bb5\u65f6\u95f4\u518d\u62c9\u9ad8\u5462？\u6211\u4eec\u770b\u4e00\u4e0bDS\u624b\u518c\u91cc\u7684\u521d\u59cb\u5316\u65f6\u5e8f\u56fe<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\u5de6\u8fb9\u90e8\u5206\u662f\u590d\u4f4d\u8109\u51b2，\u5148\u62c9\u4f4e\u603b\u7ebf（DQ）\u6700\u5c11480\u5fae\u79d2，\u4ee3\u7801\u4e2d\u62c9\u4f4e\u4e86750\u5fae\u79d2；\u4e4b\u540e\u518d\u7f13\u6162\u62c9\u9ad8<\/p>\n

\n

\u68c0\u6d4b\u51fd\u6570<\/h4>\n

u8 ds18b20_check(void)
\n{
\nu8 time_temp=0;<\/p>\n

while(DS18B20_PORT&&time_temp<10)\/\/\u7b49\u5f85DQ\u4e3a\u4f4e\u7535\u5e73，\u5faa\u73af\u68c0\u6d4bDQ\u5f15\u811a（DS_PORT）\u662f\u5426\u4e3a\u4f4e\u7535\u5e73
\n{
\ntime_temp++;
\ndelay_10us(1);
\n}
\nif(time_temp>=10)return 1;\/\/\u5982\u679c\u8d85\u65f6\u5219\u5f3a\u5236\u8fd4\u56de1
\nelse time_temp=0;\/\/\u5982\u679c\u6ca1\u8d85\u65f6，\u5c31\u628atime_temp\u590d\u4f4d
\nwhile((!DS18B20_PORT)&&time_temp<20)\/\/\u7b49\u5f85DQ\u4e3a\u9ad8\u7535\u5e73
\n{
\ntime_temp++;
\ndelay_10us(1);
\n}
\nif(time_temp>=20)return 1;\/\/\u5982\u679c\u8d85\u65f6\u5219\u5f3a\u5236\u8fd4\u56de1
\nreturn 0;
\n}<\/p>\n

\u5728\u590d\u4f4d\u5b8c\u6210\u4e4b\u540e，DS\u8fd8\u9700\u8981\u4ea7\u751f\u4e00\u4e2a60~240\u5fae\u79d2\u7684\u4f4e\u7535\u5e73，\u4ee5\u6b64\u5411\u5355\u7247\u673a\u8868\u660e \u201c\u6211\u6d3b\u7740\u5462\u201d<\/span>\u3002\u4e0a\u9762\u4ee3\u7801\u7684\u76ee\u7684\u5c31\u662f\u4ea7\u751f\u8fd9\u4e2a60~240\u5fae\u79d2\u7684\u4f4e\u5e73\u3002\u5982\u4f55\u4ea7\u751f\u5462？<\/span><\/p>\n

while(DS18B20_PORT&&time_temp<10)\/\/\u7b49\u5f85DQ\u4e3a\u4f4e\u7535\u5e73，\u5faa\u73af\u68c0\u6d4bDQ\u5f15\u811a（DS_PORT）\u662f\u5426\u4e3a\u4f4e\u7535\u5e73
\n{
\ntime_temp++;
\ndelay_10us(1);
\n}<\/p>\n

DS18B20_PORT\u5c31\u662fDQ，\u5faa\u73af\u68c0\u6d4b10\u6b21DQ\u662f\u5426\u662f\u4f4e\u7535\u5e73，\u5373\u662f\u5426\u6709100\u5fae\u79d2\u7684\u4f4e\u7535\u5e73\u72b6\u6001<\/p>\n

if(time_temp>=10)return 1;\/\/\u5982\u679c\u8d85\u65f6\u5219\u5f3a\u5236\u8fd4\u56de1
\nelse time_temp=0;\/\/\u5982\u679c\u6ca1\u8d85\u65f6，\u5c31\u628atime_temp\u590d\u4f4d<\/p>\n

\u5982\u679c\u68c0\u6d4b10\u6b21\u4e4b\u540e\u7b2c11\u6b21DQ\u8fd8\u662f\u4f4e\u7535\u5e73，\u4e00\u5b9a\u662f\u8fd9\u5b69\u5b50\u7761\u7740\u4e86，\u5c31\u5f3a\u5236\u8fd4\u56de1；<\/p>\n

\u5982\u679c\u68c0\u6d4b\u5341\u6b21\u4e4b\u5185DQ\u80fd\u81ea\u5df1\u62c9\u9ad8，\u5c31\u628a\u8ba1\u6570\u5668time_temp\u91cd\u542f，\u4ee5\u5907\u4e0b\u4e00\u6b21\u68c0\u6d4b\u3002<\/p>\n

while((!DS18B20_PORT)&&time_temp<20)\/\/\u7b49\u5f85DQ\u4e3a\u9ad8\u7535\u5e73
\n{
\ntime_temp++;
\ndelay_10us(1);
\n}
\nif(time_temp>=20)return 1;\/\/\u5982\u679c\u8d85\u65f6\u5219\u5f3a\u5236\u8fd4\u56de1<\/p>\n

DQ\u81ea\u5df1\u62c9\u9ad8\u540e，\u8fd8\u8981\u68c0\u6d4b\u5b83\u62c9\u9ad8\u4e86\u591a\u5c11\u5fae\u79d2，\u56e0\u4e3a\u4e0a\u5347\u6cbf\u8981\u4fdd\u6301\u81f3\u5c11200\u5fae\u79d2<\/p>\n

\"\"<\/p>\n

\n

\u6309\u4f4d\u8bfb\u53d6<\/h4>\n

u8 ds18b20_read_bit(void)
\n{
\nu8 dat=0;<\/p>\n

DS18B20_PORT=0;
\n_nop_();_nop_();
\nDS18B20_PORT=1;
\n_nop_();_nop_();
\nif(DS18B20_PORT)dat=1;
\nelse dat=0;
\ndelay_10us(5);\/\/\u786e\u4fdd\u6574\u4e2a\u65f6\u9699\u957f\u5ea6
\nreturn dat;
\n} <\/p>\n

DS18\u521d\u59cb\u5316\u5b8c\u6210\u540e，\u5c31\u8981\u8fdb\u884c\u6570\u636e\u4f20\u8f93，\u4ee5\u4e0a\u4ee3\u7801\u4e2d，\u5355\u7247\u673a\u901a\u8fc7DQ\u4eceDS18\u4e2d\u8bfb\u4e00\u4e2a\u4f4d\u3002\u6211\u4eec\u6ce8\u610f\u5230，\u8fd9\u91cc\u51fa\u73b0\u4e86\u548c\u521d\u59cb\u5316\u7684\u590d\u4f4d\u5f88\u50cf\u7684\u62c9\u4f4e\u5ef6\u65f6\u518d\u62c9\u9ad8\u7684\u64cd\u4f5c，\u6211\u4eec\u770b\u770b\u5199\u6570\u636e\u7684\u65f6\u5e8f\u56fe<\/p>\n

\"\"<\/p>\n

\u5355\u7247\u673a\u8981\u4eceDS18\u4e2d\u8bfb\u53d6\u6570\u636e，\u9700\u8981\u81ea\u5df1\u4ea7\u751f\u4e00\u4e2a60\u5fae\u79d2\u7684\u201c\u8bfb\u53d6\u65f6\u9699\u201d，\u4e14\u65f6\u9699\u4e4b\u95f4\u9700\u9884\u7559\u81f3\u5c11 1\u00b5s \u7684\u6062\u590d\u65f6\u95f4\u3002\u4e3b\u8bbe\u5907\u901a\u8fc7\u5c06\u5355\u7ebf\u603b\u7ebf\u62c9\u4f4e\u81f3\u5c11 1\u00b5s \u6765\u89e6\u53d1\u8bfb\u53d6\u65f6\u9699（\u5373\u4e0a\u56fe\u7684\u201cL\u201d\u9ed1\u7ebf）<\/p>\n

DS18B20_PORT=0;
\n_nop_();_nop_();\/\/_nop_()\u901a\u5e38\u4ea7\u751f1~2\u5fae\u79d2\u5ef6\u65f6，\u4e24\u4e2anop\u6ee1\u8db3\u5927\u4e8e1\u5fae\u79d2\u7684\u6761\u4ef6
\nDS18B20_PORT=1;
\n_nop_();_nop_(); <\/p>\n

\u968f\u540e\u5355\u7247\u673a\u4eceDS18\u4e2d\u8bfb\u53d6\u4f4d\u6570\u636e，\u82e5\u8bfb\u53d6\u4f4e\u4f4d，\u5c31\u5982\u5de6\u56fe；\u82e5\u8bfb\u53d6\u9ad8\u4f4d，\u5c31\u5982\u53f3\u56fe\u3002\u65e0\u8bba\u8bfb\u53d6\u5230\u4ec0\u4e48\u6570\u636e，\u8bfb\u53d6\u6240\u82b1\u7684\u65f6\u95f4\u5fc5\u987b\u4fdd\u6301\u572815\u5fae\u79d2\u4e4b\u5185<\/p>\n

if(DS18B20_PORT)dat=1;
\nelse dat=0;<\/p>\n

\u6700\u540e\u518d\u8865\u4e0a\u4e00\u6bb5\u5ef6\u65f6（50\u5fae\u79d2），\u786e\u4fdd\u6574\u4e2a\u8bfb\u53d6\u65f6\u9699\u7684\u65f6\u957f\u3002<\/p>\n

\n

\u5b57\u8282\u8bfb\u53d6<\/h4>\n

u8 ds18b20_read_byte(void)
\n{
\nu8 i=0;
\nu8 dat=0;
\nu8 temp=0;<\/p>\n

for(i=0;i<8;i++)\/\/\u5faa\u73af8\u6b21，\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4f4d，\u4e14\u5148\u8bfb\u4f4e\u4f4d\u518d\u8bfb\u9ad8\u4f4d，\u8bfb\u53d6\u516b\u6b21\u4f4d\u5c31\u5f62\u6210\u4e00\u4e2a\u5b57\u8282
\n{
\ntemp=ds18b20_read_bit();
\ndat=(temp<<7)|(dat>>1);\/\/dat\u53f3\u79fb1\u4f4d，\u5e76\u5c06temp\u7684\u7b2c0\u4f4d\u586b\u5165dat\u7684\u6700\u9ad8\u4f4d
\n}
\nreturn dat;
\n}<\/p>\n

\u8fd9\u90e8\u5206\u5c31\u4e0eDS18\u5185\u90e8\u7279\u6027\u6ca1\u4ec0\u4e48\u5173\u7cfb\u4e86，\u539f\u7406\u662f\u75288\u6b21\u5faa\u73af\u8bfb\u53d68\u4e2a\u4f4d，\u7136\u540e\u628a\u4e32\u884c\u8f93\u5165\u5e76\u884c\u8f93\u51fa\u62108\u4f4d\u7684dat<\/p>\n

\n

\u5b57\u8282\u5199\u5165<\/h4>\n

void ds18b20_write_byte(u8 dat)
\n{
\nu8 i=0;
\nu8 temp=0;<\/p>\n

for(i=0;i<8;i++)\/\/\u5faa\u73af8\u6b21，\u6bcf\u6b21\u5199\u4e00\u4f4d，\u4e14\u5148\u5199\u4f4e\u4f4d\u518d\u5199\u9ad8\u4f4d
\n{
\ntemp=dat&0x01;\/\/\u9009\u62e9\u4f4e\u4f4d\u51c6\u5907\u5199\u5165，\u8fd9\u90e8\u5206\u5c5e\u4e8e\u91c7\u6837\u7a97\u53e3
\ndat>>=1;\/\/\u5c06\u6b21\u9ad8\u4f4d\u79fb\u5230\u4f4e\u4f4d
\nif(temp)
\n{
\nDS18B20_PORT=0;
\n_nop_();_nop_();
\nDS18B20_PORT=1;
\ndelay_10us(6);\/\/\u8fdb\u884c\u4e00\u6b21\u8bfb\u53d6\u65f6\u9699
\n}
\nelse
\n{
\nDS18B20_PORT=0;
\ndelay_10us(6);
\nDS18B20_PORT=1;
\n_nop_();_nop_();
\n}
\n}
\n}<\/p>\n

\u8fd9\u90e8\u5206\u539f\u7406\u662f，\u4ece\u6700\u4f4e\u4f4d\u5f00\u59cb\u8bfb\u53d6dat（dat\u662f8\u4f4d\u6570\u636e），\u82e5\u8bfb\u53d6\u5230\u9ad8\u4f4d，\u5219\u5411DS18\u4e2d\u5199\u51651；\u82e5\u8bfb\u53d6\u5230\u4f4e\u4f4d，\u5219\u5411DS18\u4e2d\u5199\u51650\u3002\u4e00\u5171\u5faa\u73af8\u6b21（\u521a\u597d\u4e00\u4e2a\u5b57\u8282），\u6bcf\u6b21\u8bfb\u53d6\u540e，dat\u5c31\u53f3\u79fb\u4e00\u4f4d，\u539f\u6765\u7684\u6b21\u4f4e\u4f4d\u5c31\u53d8\u6210\u4f4e\u4f4d\u7ee7\u7eed\u88ab\u8bfb\u53d6\u3002<\/p>\n

\n

\u5f00\u542f\u6e29\u8f6c<\/h4>\n

void ds18b20_start(void)
\n{
\nds18b20_reset();\/\/\u590d\u4f4d
\nds18b20_check();\/\/\u68c0\u67e5DS18B20
\nds18b20_write_byte(0xcc);\/\/\u540c\u65f6\u63a7\u5236\u603b\u7ebf\u6240\u6709\u8bbe\u5907
\n ds18b20_write_byte(0x44);\/\/\u8f6c\u6362\u547d\u4ee4
\n}<\/p>\n

\u6587\u7ae0\u5f00\u5934\u63d0\u8fc7，DS18\u662f\u6570\u5b57\u6e29\u5ea6\u8ba1，\u56e0\u4e3a\u5b83\u80fd\u81ea\u5df1\u8fdb\u884c\u6a21\u6570\u8f6c\u6362，\u4e0a\u9762\u4ee3\u7801\u5c31\u662f\u542f\u52a8\u6a21\u6570\u8f6c\u6362<\/p>\n

\u9996\u5148\u521d\u59cb\u5316（\u590d\u4f4d\u548c\u68c0\u6d4b）；\u7136\u540e\u8df3\u8fc7Read ROM\u6307\u4ee4，\u4e5f\u5c31\u662f\u4e0d\u770b\u8eab\u4efd\u8bc1，\u76f4\u63a5\u63a7\u5236DS18；\u6700\u540e\u5411DS18\u8f93\u5165AD\u8f6c\u6362\u547d\u4ee4，\u8fd9\u6837DS18\u5185\u90e8\u5c31\u4f1a\u81ea\u52a8\u628a\u91c7\u96c6\u7684\u6a21\u62df\u91cf\u6e29\u5ea6\u8f6c\u6362\u6210\u6570\u5b57\u91cf\u3002<\/p>\n

\n

\u521d\u59cb\u5316<\/h4>\n

u8 ds18b20_init(void)
\n{
\nds18b20_reset();
\nreturn ds18b20_check();
\n}<\/p>\n

\u4e3a\u4ec0\u4e48DS18\u4e5f\u9700\u8981\u521d\u59cb\u5316？\u56e0\u4e3a\u8fd9\u662f1-Wire\u534f\u8bae\u7684\u6807\u51c6\u6d41\u7a0b<\/p>\n

\u6bcf\u6b21\u65b0\u7684\u901a\u4fe1\u4f1a\u8bdd\u90fd\u5fc5\u987b\u4ee5\u590d\u4f4d\u548c\u5b58\u5728\u68c0\u6d4b\u5f00\u59cb<\/span><\/p>\n

\n

\u6e29\u5ea6\u8bfb\u53d6<\/h4>\n

float ds18b20_read_temperture(void)
\n{
\nfloat temp;
\nu8 dath=0;
\nu8 datl=0;
\nu16 value=0;<\/p>\n

ds18b20_start();
\nds18b20_reset();
\nds18b20_check();
\nds18b20_write_byte(0xcc);
\n ds18b20_write_byte(0xbe);<\/p>\n

datl=ds18b20_read_byte();
\ndath=ds18b20_read_byte();
\nvalue=(dath<<8)+datl;
\nif((value&0xf800)==0xf800)
\n{
\nvalue=(~value)+1;
\ntemp=value*(-0.0625);
\n}
\nelse
\n{
\ntemp=value*0.0625;
\n}
\nreturn temp;
\n}<\/p>\n

\u8fd9\u90e8\u5206\u5c31\u662f\u4eceDS18\u83b7\u53d6\u6570\u5b57\u6e29\u5ea6\u503c\u7684\u51fd\u6570，\u6211\u4eec\u6765\u770b\u770b\u5b83\u662f\u5982\u4f55\u8fd0\u4f5c\u7684<\/p>\n

\u9996\u5148\u5b9a\u4e49\u6e29\u5ea6\u503c\u4e3a\u6d6e\u70b9\u6570（\u56e0\u4e3a\u6e29\u5ea6\u6709\u96f6\u6709\u6574，\u6709\u6b63\u6709\u8d1f）；<\/p>\n

\u7136\u540e\u4f9d\u6b21\u5f00\u542fAD\u8f6c\u6362\u3001\u521d\u59cb\u5316\u3001\u8df3\u8fc7ROM（\u4e0d\u770b\u8eab\u4efd\u8bc1）\u3002\u5b8c\u6210\u51c6\u5907\u5de5\u4f5c\u540e，\u53ef\u4ee5\u8fdb\u884c\u8bfb\u53d6\u4e86<\/p>\n

ds18b20_write_byte(0xbe);<\/p>\n

\u4ee5\u4e0a\u547d\u4ee4\u662fRead Scratchpad[0xbe]，\u901a\u8fc7DQ\u4ece\u6682\u5b58\u5668\u5b57\u82820\u7684\u6700\u4f4e\u6709\u6548\u4f4d\u5f00\u59cb，\u76f4\u5230\u5b57\u82829（\u5373CRC\u5b57\u8282）<\/p>\n\n\u5b57\u8282\u5730\u5740\u540d\u79f0\u529f\u80fd\u662f\u5426\u53ef\u6620\u5c04\u5230EEPROM<\/tr>\n\n\n\n\n\n\n\n\n\n
Byte 0<\/td>\n\u6e29\u5ea6LSB<\/td>\n\u6e29\u5ea6\u503c\u4f4e\u56db\u4f4d(\u5305\u542b\u5c0f\u6570\u90e8\u5206)<\/td>\n\u5426（\u8fd0\u884c\u65f6\u6570\u636e）<\/td>\n<\/tr>\n
Byte 1<\/td>\n\u6e29\u5ea6MSB<\/td>\n\u6e29\u5ea6\u503c\u9ad8 8 \u4f4d（\u5305\u542b\u7b26\u53f7\u4f4d）<\/td>\n\u5426（\u8fd0\u884c\u65f6\u6570\u636e）<\/td>\n<\/tr>\n
Byte 2<\/td>\nTH\u5bc4\u5b58\u5668<\/td>\n\u9ad8\u6e29\u62a5\u8b66\u9608\u503c<\/td>\n\u662f（\u5b57\u8282 2 \u7684 EEPROM \u5907\u4efd）<\/td>\n<\/tr>\n
Byte 3<\/td>\nTL\u5bc4\u5b58\u5668<\/td>\n\u4f4e\u6e29\u62a5\u8b66\u9608\u503c<\/td>\n\u662f（\u5b57\u8282 3 \u7684 EEPROM \u5907\u4efd）<\/td>\n<\/tr>\n
Byte 4<\/td>\n\u914d\u7f6e\u5bc4\u5b58\u5668<\/td>\n\u5206\u8fa8\u7387\u8bbe\u7f6e<\/td>\n\u662f（\u5b57\u8282 4 \u7684 EEPROM \u5907\u4efd）<\/td>\n<\/tr>\n
Byte 5<\/td>\n\u4fdd\u7559<\/td>\n<\/td>\n\u5426<\/td>\n<\/tr>\n
Byte 6<\/td>\n\u4fdd\u7559<\/td>\n<\/td>\n\u5426<\/td>\n<\/tr>\n
Byte 7<\/td>\n\u4fdd\u7559<\/td>\n<\/td>\n\u5426<\/td>\n<\/tr>\n
Byte 8<\/td>\nCRC\u5b57\u8282<\/td>\n\u5bf9Byte0~7\u7684\u5faa\u73af\u5197\u4f59\u6821\u9a8c\u7801<\/td>\n\u5426<\/td>\n<\/tr>\n<\/table>\n

\u4ece\u4e0a\u8868\u4e5f\u53ef\u4ee5\u770b\u51fa，\u6e29\u5ea6\u6570\u636e\u662f\u5148\u4f20\u4f4e\u4f4d\u518d\u4f20\u9ad8\u4f4d\u7684，\u6240\u4ee5\u53ef\u4ee5\u501f\u52a9\u65f6\u5e8f\u7279\u70b9\u628a\u9ad8\u4f4d\u548c\u4f4e\u4f4d\u5206\u522b\u5b58\u50a8\u8d77\u6765：<\/p>\n

datl=ds18b20_read_byte();
\ndath=ds18b20_read_byte();<\/p>\n

\u7136\u540e\u5c31\u662f\u7d22\u7136\u65e0\u5473\u7684\u79fb\u4f4d\u3001\u5408\u5e76\u6d41\u7a0b\u3002\u6700\u540e\u901a\u8fc7(value&0xf800)==0xf800\u786e\u5b9a\u6e29\u5ea6\u503c\u662f\u6b63\u503c\u8fd8\u662f\u8d1f\u503c，\u628a\u8f6c\u7801\u5f97\u5230\u7684\u6e29\u5ea6\u503c（DS18\u7684\u6e29\u5ea6\u503c\u662f\u4ee516\u4f4d\u4e8c\u8fdb\u5236\u8865\u7801\u5f62\u5f0f\u5b58\u50a8，\u6240\u4ee5\u9700\u8981\u8f6c\u7801）\u4e58\u4ee5\u7cbe\u5ea6（0.0625）\u5f97\u5230\u5bf9\u5e94\u5206\u8fa8\u7387\u4e0b\u7684\u6e29\u5ea6\u503c\u3002<\/p>\n

\n

\u81f3\u6b64，\u6211\u4eec\u5df2\u7ecf\u5206\u6790\u5b8c\u62108\u4e2aDS18B20\u51fd\u6570\u7684\u529f\u80fd，\u8fd9\u90e8\u5206\u5b9e\u9645\u4e0a\u5df2\u7ecf\u7b97\u662f\u6a21\u5757\u5316\u4e86，\u4e5f\u5c31\u662f\u8bf4\u6211\u4eec\u5df2\u7ecf\u5b8c\u6210\u4e86\u6e29\u5ea6\u68c0\u6d4b\u90e8\u5206，\u5269\u4e0b\u7684\u663e\u793a，\u65e0\u8bba\u662f\u6570\u7801\u7ba1\u3001LCD1602，\u53c8\u6216\u8005\u662fLCD12864，\u90fd\u53ef\u4ee5\u5b8c\u6210，\u4f46\u8003\u8651\u5230\u6570\u7801\u7ba1\u539f\u7406\u6bd4\u8f83\u7b80\u5355，\u6240\u4ee5\u8fd9\u91cc\u6211\u4eec\u9009\u62e9\u6570\u7801\u7ba1\u663e\u793a\u6e29\u5ea6\u3002<\/p>\n

\u4e8c\u3001\u6570\u7801\u7ba1\u90e8\u5206<\/h2>\n

\/\/\u5171\u9634\u6781\u6570\u7801\u7ba1\u663e\u793a0~F\u7684\u6bb5\u7801\u6570\u636e
\nu8 gsmg_code[17]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};<\/p>\n

void smg_display(u8 dat[],u8 pos)
\n{
\nu8 i=0;
\nu8 pos_temp=pos-1;<\/p>\n

for(i=pos_temp;i<8;i++)
\n{
\n switch(i)\/\/\u4f4d\u9009
\n{
\ncase 0: LSC=1;LSB=1;LSA=1;break;
\ncase 1: LSC=1;LSB=1;LSA=0;break;
\ncase 2: LSC=1;LSB=0;LSA=1;break;
\ncase 3: LSC=1;LSB=0;LSA=0;break;
\ncase 4: LSC=0;LSB=1;LSA=1;break;
\ncase 5: LSC=0;LSB=1;LSA=0;break;
\ncase 6: LSC=0;LSB=0;LSA=1;break;
\ncase 7: LSC=0;LSB=0;LSA=0;break;
\n}
\nSMG_A_DP_PORT=dat[i-pos_temp];\/\/\u4f20\u9001\u6bb5\u9009\u6570\u636e
\ndelay_10us(100);\/\/\u5ef6\u65f6\u4e00\u6bb5\u65f6\u95f4，\u7b49\u5f85\u663e\u793a\u7a33\u5b9a
\nSMG_A_DP_PORT=0x00;\/\/\u6d88\u97f3
\n}
\n}<\/p>\n

\u5f00\u5934\u7684gsmg_code\u6570\u7ec4\u5b9e\u9645\u4e0a\u5b58\u50a8\u4e86\u5171\u9634\u6781\u6570\u7801\u7ba10~F\u5f62\u72b6\u7684\u6bb5\u9009\u6570\u636e\u3002\u7136\u540e\u8f93\u5165\u8d77\u59cb\u4f4d\u7f6e（pos），8\u4f4d\u6570\u7801\u7ba1\u5c31\u4f1a\u4ece\u8fd9\u4e00\u4f4d\u5f00\u59cb，\u4f9d\u6b21\u5411\u53f3\u79fb\u52a8，\u79fb\u52a8\u7684\u540c\u65f6\u4f1a\u586b\u5165\u76f8\u5e94\u7684\u6bb5\u9009\u6570\u636e<\/p>\n

\u4e09\u3001\u4e3b\u51fd\u6570\u90e8\u5206<\/h2>\n

#include "public.h"
\n#include "smg.h"
\n#include "ds18b20.h"<\/p>\n

void main()
\n{
\nu8 i=0;
\n int temp_value;
\nu8 temp_buf[5];<\/p>\n

ds18b20_init();\/\/\u521d\u59cb\u5316DS18B20<\/p>\n

while(1)
\n{
\ni++;
\nif(i%50==0)\/\/\u95f4\u9694\u4e00\u6bb5\u65f6\u95f4\u8bfb\u53d6\u6e29\u5ea6\u503c，\u95f4\u9694\u65f6\u95f4\u8981\u5927\u4e8e\u6e29\u5ea6\u4f20\u611f\u5668\u8f6c\u6362\u6e29\u5ea6\u65f6\u95f4
\ntemp_value=ds18b20_read_temperture()*10;\/\/\u4fdd\u7559\u6e29\u5ea6\u503c\u5c0f\u6570\u540e\u4e00\u4f4d
\nif(temp_value<0)\/\/\u8d1f\u6e29\u5ea6
\n{
\ntemp_value=-temp_value;
\ntemp_buf[0]=0x40;\/\/\u663e\u793a\u8d1f\u53f7
\n}
\nelse temp_buf[0]=0x00;\/\/\u4e0d\u663e\u793a<\/p>\n

temp_buf[1]=gsmg_code[temp_value\/1000];\/\/\u767e\u4f4d
\ntemp_buf[2]=gsmg_code[temp_value%1000\/100];\/\/\u5341\u4f4d
\ntemp_buf[3]=gsmg_code[temp_value%1000%100\/10]|0x80;\/\/\u4e2a\u4f4d+\u5c0f\u6570\u70b9
\ntemp_buf[4]=gsmg_code[temp_value%1000%100%10];\/\/\u5c0f\u6570\u70b9\u540e\u4e00\u4f4d
\nsmg_display(temp_buf,4);
\n}
\n}<\/p>\n

\u76f8\u8f83\u4e8eDS18，\u4e3b\u51fd\u6570\u90e8\u5206\u5c31\u5f88\u597d\u89e3\u91ca\u4e86，\u53ef\u4ee5\u6309\u4f5c\u7528\u5206\u6210\u51e0\u4e2a\u90e8\u5206：\u663e\u793a\u4f4d\u6570\u5b9a\u4e49\u3001\u8bfb\u53d6\u6e29\u5ea6\u503c\u3001\u8fdb\u4f4d\u663e\u793a<\/p>\n

\u663e\u793a\u4f4d\u6570\u5b9a\u4e49<\/h4>\n

u8 temp_buf[5];<\/p>\n

\u5b9a\u4e49\u4e00\u4e2a5\u4f4d\u6570\u7ec4，\u5305\u62ec\u7b26\u53f7\u4f4d\u3001\u767e\u4f4d\u3001\u5341\u4f4d\u3001\u4e2a\u4f4d（\u5c0f\u6570\u70b9\u4e0e\u4e2a\u4f4d\u5171\u7528\u4e00\u4f4d）\u3001\u5c0f\u6570\u70b9\u540e\u4e00\u4f4d\u3002<\/p>\n

\u8bfb\u53d6\u6e29\u5ea6\u503c<\/h4>\n

if(i%50==0)\/\/\u95f4\u9694\u4e00\u6bb5\u65f6\u95f4\u8bfb\u53d6\u6e29\u5ea6\u503c，\u95f4\u9694\u65f6\u95f4\u8981\u5927\u4e8e\u6e29\u5ea6\u4f20\u611f\u5668\u8f6c\u6362\u6e29\u5ea6\u65f6\u95f4
\ntemp_value=ds18b20_read_temperture()*10;\/\/\u4fdd\u7559\u6e29\u5ea6\u503c\u5c0f\u6570\u540e\u4e00\u4f4d
\nif(temp_value<0)\/\/\u8d1f\u6e29\u5ea6
\n{
\ntemp_value=-temp_value;
\ntemp_buf[0]=0x40;\/\/\u663e\u793a\u8d1f\u53f7
\n}
\nelse temp_buf[0]=0x00;\/\/\u4e0d\u663e\u793a<\/p>\n

\u8bfb\u53d6\u6e29\u5ea6\u95f4\u9699\u4e0d\u80fd\u8fc7\u77ed，\u6240\u4ee5\u8bbe\u7f6ei\u4f5c\u4e3a\u8ba1\u65f6\u5668\u3001\u6bcf50\u6b21\u5faa\u73af\u8bfb\u53d6\u4e00\u6b21\u6e29\u5ea6；\u7136\u540e\u68c0\u6d4b\u6e29\u5ea6\u6b63\u8d1f\u503c：\u82e5\u4e3a\u6b63，\u76f4\u63a5\u663e\u793a；\u82e5\u4e3a\u8d1f，\u7ffb\u8f6c\u540e\u52a0\u4e2a\u8d1f\u53f7\u518d\u663e\u793a\u3002<\/p>\n

\u8fdb\u4f4d\u663e\u793a<\/h4>\n

temp_buf[1]=gsmg_code[temp_value\/1000];\/\/\u767e\u4f4d
\ntemp_buf[2]=gsmg_code[temp_value%1000\/100];\/\/\u5341\u4f4d
\ntemp_buf[3]=gsmg_code[temp_value%1000%100\/10]|0x80;\/\/\u4e2a\u4f4d+\u5c0f\u6570\u70b9
\ntemp_buf[4]=gsmg_code[temp_value%1000%100%10];\/\/\u5c0f\u6570\u70b9\u540e\u4e00\u4f4d
\nsmg_display(temp_buf,4);<\/p>\n

\u56e0\u4e3a\u524d\u9762\u5728\u8bfb\u53d6\u6e29\u5ea6\u65f6\u4e58\u4e8610，\u76f8\u5f53\u4e8e\u53ea\u4fdd\u7559\u4e00\u4f4d\u5c0f\u6570，\u6240\u4ee5\u8fd9\u91cc\u7684\u767e\u4f4d\u5c31\u4ece\u539f\u6765\u7684value\/100\u53d8\u6210value\/1000，\u540e\u9762\u540c\u7406\u3002\u5728\u5c06\u6e29\u5ea6\u503c\u56db\u4f4d\u6570\u636e\u90fd\u5199\u8fdb\u6570\u7ec4tem_buf[]\u540e，\u6570\u7801\u7ba1\u663e\u793a\u51fd\u6570\u4ece8\u4f4d\u6570\u7801\u7ba1\u7684\u7b2c\u56db\u4f4d\u5f00\u59cb\u4f9d\u6b21\u663e\u793a\u3002<\/p>\n

\"\"<\/p>\n","protected":false},"excerpt":{"rendered":"

\u4e3b\u51fd\u6570#include \\”public.h\\”void main()
\n{
\nu8 i0;int temp_value;
\nu8 temp_buf[5];ds18b20_init();\/\/\u521d\u59cb\u5316DS18B20while(1)
\n{
\ni;
\nif(i%500)\/\/\u95f4\u9694\u4e00\u6bb5\u65f6\u95f4\u8bfb\u53d6\u6e29\u5ea6\u503c，\u95f4\u9694\u65f6\u95f4\u8981\u5927\u4e8e\u6e29\u5ea6\u4f20\u611f\u5668\u8f6c\u6362\u6e29\u5ea6\u65f6\u95f4
\ntemp_valueds18b20_read_temperture()*10;\/\/\u4fdd\u7559\u6e29\u5ea6\u503c\u5c0f\u6570\u540e\u4e00\u4f4d
\nif(temp_value<0)\/\/\u8d1f\u6e29\u5ea6
\n{
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